Steven Spielberg is adding another film to his growing list of prospective projects.

Variety reports that Spielberg has joined The Kidnapping of Edgardo Mortara as a producer and, possibly, director. Written by Tony Kushner, the scribe behind Spielberg's Munich and Lincoln, the screenplay is based on author David Kertzer's book of the same name. The story tells the true-life account of a young Italian Jew taken from his parents by the Church in 1858 and raised as a Catholic. The seven-year-old Mortara would eventually go on to become a priest in the Augustinian order.

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Insiders claim that The Kidnapping of Edgardo Mortara will not be the filmmaker's next project as Kushner's script is still in the early stages. The two films Spielberg is reportedly deciding between for his next directorial gig are the long-gestating Robopocalypse and the historical drama Montezuma -- which is currently being written by another Spielberg collaborator, Steven Zaillian (Schindler's List).

While sources say that Spielberg has committed to nothing as of yet, some insist that Robopocalypse is the project furthest along with a completed rewrite and a nearly finalized budget. Thor's Chris Hemsworth has been attached to star.